One thing that I have tried worked , and that's green lipped mussel extract. We bought ours from Boots at the time. Apparently Maori people have a very low incidence of joint issues and scientists deduced it was down to a diet which contained green lipped mussels.
I first heard about it in the 90's , and used it at first for an arthritic dog! Seeing the improvement in the dog ( a breed that had joint issues) , my husband decided if it was good enough for the dog he would try it ( it is tested for human consumption) .
He too, felt a great improvement in his joints and has continued to this day . It's not cheap but certainly, we actually saw how much better the dog was and my husband has very little joint pain at all.